Flocking:
Flocking is the process of applying a mineral to the water that will collect the soil particles, and sink them to the bottom.
The most common mineral used is alum. As I said earlier, the source of the turbidity should be addressed adding or increasing vegetation, and the vegetative barrier.
The amount of alum you will need will be determined by the severity of the problem, and the volume of water in the pond. I will add more on this latter.
Once this and the pH are correct, you can begin to fertilize the pond.
